Judging by your road movies, most of those 600 miles you'd be driving in a straight line. In the Old Continent, roads are traced around old crop fields and other properties, so you need to pay full attention to the road the whole time.
Yeah, at least in my part of the US, that's very true. The roads do curve a bit of course, but they're straight enough that you drive 55 - 80 mph (88 - 130 kph) for almost the whole trip. And a lot of the time, there are at least two lanes to pick from -- common courtesy is that slower cars stay in the right lane so that faster drivers can pass them.
